Electric-light fixture



0. KUPFERMAN.

ELECTRIC -LIGHT FIXTURE.

APPLICATION FILED OCT. 15, I920.

Patented Mar. 21, 1922.

fl vwewtoz $9M M owe UNITED STATES. PATENT OFFICE.

OSCAR KUPIEBIAN, OF BROOKLYN, NEW YORK.

METRIC-LIGHT FIXTURE.

s e mcation l t e'n men. Patented Mar. 21, '1922.

Application flleql October 15, 1920. Serial No. 417,272.

candescent electric lamps, and particularly to such fixtures which are formed of flexibly connected sections, enabling the adjustment of the section carrying the lamp to different positions.

The construction of the jolnts' hitherto used with such sections is objectionable-for the reason that the locking and unlocking of the sections are rendered somewhat tedious owing to the necessity of tlghtemng and untightening a nut or set screw. By fre quent slackening and tightening of the nut or of the set screw, the arts quickly wear out and fail to lock the amp carrying section in its adjusted position.

The object of this invention is to remove this drawback and to provide a joint, the locking and unlocking of which can be readil and easily efi'ected by the manipulatlon of a push member.

My invention will be more fully understood by reference to the accompanying drawing, in which similar characters denote corresponding parts, and in which;

Fig. 1 is an elevation of an electric lamp fixture equipped with my new joint; Fig. '2 is an enlarged elevation of the joint itself; Fig. 3 is a side view thereof, with a part broken away to show some details of construction; Fig. 4 is a vertical section on line 4-4. of Fig. 3; and Fig. 5 is a vertical section'on line 5-5 of Fig. 2.

Referring more specifically to the drawing a denotes an electric lamp fixture and b the electric bulb. The fixture is exemplified by a stand which consists of a base and a hollow tubular post composed of two sections a, a flexibly connected to one another by the joint 0 forming the subject of the resent application.

T e joint 0 is composed of two outwardly symmetrical cylindrical shells or cup shaped sections 0', 0 adapted to rotatively bear with the edges of their 0 en faces or sides against one another. ach section is formed integrally on its circumference with an inwardly threadedsocket c the central longitudinal axes of which are in alignment wit one another and extend through the central plane in which the sections bear against one another. The part c of the bottom of each socket which overlaps the opposite section 1s cylindrically curved and cut away sufiiciently to clear the latter, in order to reduce the friction between the adjoining movable sections.

The sockets serve to receive the screw threaded ends a of the tubular sections a, of of the fixture. Each shell is also rev ded with a recess a leading from the mterlor thereof into the corres onding socket and serving as a passage or the electric wires (1 extending through the fixture.

Projecting centrally from the end wall of i the shell or section, a, is a tubular projectlon a? and provided in the end wall of the opposite shell or section a is a'central'circular opening through which said projection 0 passes outwardly. The free end a of said projection a is threaded to receive a nut n for the tightening of the two sections in assembled position. e denotes a washer between the nut n and the outer face of section 0 Adapted to bear loosely on the outer face of the side wall of section 0 is a disk sha d locking member f which is centrally fixe to or formed inte ally with an arbor or rod 9 adapted to slidably bear in a central perforation a made in said wall and extend through thetubular projection c". The free end of said rod is screw threaded as .at g and screwed thereon is a cylindrical head piece It slidably engaging in and guided by the tubular projection c.

The disk 7. is provided on its inner face near its circumference with a locking member z in form of a pin or the like which extends parallel to the arbor or rod 9 and is adapted to pass outwardly through a bore a made in the wall of the shellor section 0' toward the bearing edge of the opposite section 0 In this edge provide a plurality of notches or bores 0 distributed in a circle thereon and each capable of receiving the free end of the locking pin 71 when the parts areassembled and the shells or sections 0, c are in locked position.

The disk f is held in looking position by a spring j mounted in the tube 0, around the arbor g and acting against the inner face of the head piece or plunger h.

Thus the two sections a, c are positively locked together through the engagement of the locking member a with any one of the notches c in the shell 0 To unlock the sections of the fixture and permit the adjustment of the lamp carrying section to a difl'erent position, all that is necessary to do is to press the plunger inwardly against the tension of the spring 7', which causes the lockin disk to move away from the section 0 witidrawing the locking pin from ongagement with the shell 0. After the adjustment of the fixture to the desired 1nclination the lunger h is released and the locking disk is drawn back into the locking position by the spring the pin 2' snapping into the corresponding notch 0 of the section a. Thus by a simple push action in one direction, the unlocking can be efiected, and by the action of a spring, the locking can be efi'ected.

What I claim and desire to secure by Letters Patent is:

An electric lamp fixture, comprislng hollow threaded post sections and a joint between said sections rendering them adjustable to different angles, said joint comprising two cup shaped shells adapted to movably bear with their open faces on one another and each havin r an inwardly threaded socket to receive said post sections, one of said shells having a plurality of holes around its mouth and the other shell having a sleeve like projection, a disk movably hearing against the outer face of said last named shell and formed with a cross pin adapted to pass into any of said holes to lock said shells in a certain position, a rod projecting centrally from said disk through said sleeve, a not working on said sleeve to connect said two shells together, a push member carried by the free end of said rod and guided in said sleeve and a spring in said sleeve acting against said push member, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

OSCAR KUPFERMAN. Witnesses:

Max D. ORDMANN, Josnrn T. MCMAHON. 

